I called the Wilcap company several weeks ago. Their contact information is: Wilcap Company; Post Office Box 763; Pismo Beach, CA 93448; Tel: (805)481-7639; FAX: (805)343-5000; Email: pmcguire@wilcap.com.
They have an adapter kit to put a T-5 Borg Warner five speed, or, for that matter,
any manual chevy transmission behind a flat head 6 cylinder Mopar. The kit # is 230-350 MT. The “MT” stands for “manual transmission.” The kit consists of an adapter plate which goes between the engine and the bellhousing and a flywheel. You use the Chevy bellhousing. It works with any Chevy standard transmission and a 10½” Chevy pressure plate. The hole for the starter can be placed either low on the driver or passenger’s side. It cannot go up high. The kit weighs about 50 lbs. and the shipping cost is about $50, maybe a little less.
He said that they do not keep these kits in stock but rather the adapter and the
flywheel are custom made when the order is placed. The turnaround time on an order
is about three weeks. I don't remember the exact cost but believe it is something between $600 and $700.